Department of Soil Science and Agricultural Chemistry, Universidade de Santiago de Compostela, 15782, Santiago de Compostela, Spain.
Technological Research Institute, Universidade de Santiago de Compostela, 15782, Santiago de Compostela, Spain.
Environ Sci Pollut Res Int. 2019 Apr;26(12):11605-11617. doi: 10.1007/s11356-018-3798-9. Epub 2018 Nov 27.
Pyrolysis of waste materials to produce biochar is an excellent and suitable alternative supporting a circular bio-based economy. One of the properties attributed to biochar is the capacity for sorbing organic contaminants, which is determined by its composition and physicochemical characteristics. In this study, the capacity of waste-derived biochar to retain volatile fuel organic compounds (benzene, toluene, ethylbenzene and xylene (BTEX) and fuel oxygenates (FO)) from artificially contaminated water was assessed using batch-based sorption experiments. Additionally, the sorption isotherms were established. The results showed significant differences between BTEX and FO sorption on biochar, being the most hydrophobic and non-polar contaminants those showing the highest retention. Furthermore, the sorption process reflected a multilayer behaviour and a relatively high sorption capacity of the biochar materials. Langmuir and Freundlich models were adequate to describe the experimental results and to detect general differences in the sorption behaviour of volatile fuel organic compounds. It was also observed that the feedstock material and biochar pyrolysis conditions had a significant influence in the sorption process. The highest sorption capacity was found in biochars produced at high temperature (> 400 °C) and thus rich in aromatic C, such as eucalyptus and corn cob biochars. Overall, waste-derived biochar offers a viable alternative to be used in the remediation of volatile fuel organic compounds from water due to its high sorption capacity.
将废物热解制成生物炭是一种极好且合适的选择，可以支持循环生物基经济。生物炭的特性之一是吸附有机污染物的能力，这取决于其组成和物理化学特性。在这项研究中，使用基于批量的吸附实验评估了废生物质制成的生物炭从人工污染水中保留挥发性燃料有机化合物（苯、甲苯、乙苯和二甲苯（BTEX）和燃料含氧化合物（FO）的能力。此外，还建立了吸附等温线。结果表明，BTEX 和 FO 在生物炭上的吸附存在显著差异，最疏水和非极性的污染物表现出最高的保留。此外，吸附过程反映了多层行为和生物炭材料相对较高的吸附能力。朗缪尔和弗伦德利希模型足以描述实验结果，并检测挥发性燃料有机化合物吸附行为的一般差异。还观察到，原料和生物炭热解条件对吸附过程有显著影响。在高温（>400°C）下产生的生物炭中发现了最高的吸附能力，因此富含芳香族 C，如桉树和玉米芯生物炭。总体而言，由于具有高吸附能力，废生物质制成的生物炭为从水中去除挥发性燃料有机化合物提供了一种可行的替代方法。
